Sink drain



FIG. 1 is a perspective view of the sink drain in a sink.

FIG. 2 is a perspective view of the sink drain in a sink.

FIG. 3 is a sectional view taken along line 3-3 as shown in FIG. 5 ofthe sink drain.

FIG. 4 is a an enlarged sectional view taken from line 4 as shown inFIG. 3 of the sink drain.

FIG. 5 is a plan view of the sink drain in a sink.

FIG. 6 is a plan view taken along line 6 as shown in FIG. 3 of the sinkdrain.

FIG. 7 is a perspective view of the sink drain shown removed from thesink; and,

FIG. 8 is an exploded side view of the sink drain shown removed from thesink.

The broken line showing is included for the purpose of illustrativepurposes and form no part of the claimed design.

The ornamental design for a sink drain, as shown and described.